There's a famous Bakso Seller in Jagalan
Street Surabaya, called Bakso 87. It's very popular, and you need to shell out some dough to eat here. It costs as much as Rp 50.000 for a bowl of Bakso. There's a less known alternative, another Bakso seller
in the vicinity. Costing much cheaper with similar good taste, albeit
simpler menu, Bakso Pak Doel.

Bakso Pak Doel

If you're not familiar with Bakso, here's a short
description from Wikipedia :